I would use a "dolly" on underside when hammering the strut tower (its not a frame) back down flat. The dolly will aid you in not knocking it dented downward. Dolly is a common tool body guys use. You might take measurements on opposite side to get feel for how far down you need to go. Good luck.
P.S. A little bit of white paint to make it look nice after would be fine. Our E90s are 10+ years old so don't go anal on worrying chipping the paint. I pulled my camber pins as I converted to Ground Control Coil Overs.
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